Ray Gel is the brand name of a gel formulation containing reduced glutathione, L-cysteine, and anthocyanins with potential antioxidant, immunostimulating, and chemoprotective activities. Reduced glutathione is the primary cellular antioxidant and plays important roles in the antioxidation of free radicals. In addition, glutathione affects DNA synthesis and repair and exerts immunostimulating activity by increasing the production of interleukin-2. The flavonoid anthocyanins derived from various blue and purple flowering plants have antioxidant properties. Ray Gel has been tested as an intervention for radiodermatitis.